Veronika Eyring, German Aerospace Center (DLR), Oberpfaffenhofen, Germany, Pierre Gentine, Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States, Gunnar Behrens, German Aerospace Center DLR Oberpfaffenhofen, Oberpfaffenhofen, Germany, Mike S Pritchard, University California Irvine, Department of Earth System Science, Irvine, CA, United States, Stephan Rasp, Technical University of Munich, Munich, Germany and Jakob Runge, German Aerospace Center, Jena, Germany